Vulnerability · Published Nov 4, 2021 · Assigned by cisco

CVE-2021-40126Cisco Umbrella Email Enumeration Vulnerability

Medium 4.3

In plain English

A medium-severity security flaw in Cisco Umbrella Insights Virtual Appliance from Cisco. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 59% of all known vulnerabilities).

Severity (CVSS 3.1)4.3Medium

Exploit odds (30 days)0.9%top 40.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

A vulnerability in the web-based dashboard of Cisco Umbrella could allow an authenticated, remote attacker to perform an email enumeration attack against the Umbrella infrastructure. This vulnerability is due to an overly descriptive error message on the dashboard that appears when a user attempts to modify their email address when the new address already exists in the system. An attacker could exploit this vulnerability by attempting to modify the user's email address. A successful exploit could allow the attacker to enumerate email addresses of users in the system.

Affected products (as reported)

Vendor	Product	Versions
Cisco	Cisco Umbrella Insights Virtual Appliance	n/a

Weakness: CWE-210 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

References

20211103 Cisco Umbrella Email Enumeration Vulnerability vendor-advisory, x_refsource_CISCO